| 单词 | index of refraction |
| 释义 | index of refraction Optics. a number indicating the speed of light in a given medium as either the ratio of the speed of light in a vacuum to that in the given medium (absolute index of refraction) or the ratio of the speed of light in a specified medium to that in the given medium (relative index of refraction). Symbol: n Also called index, refractive index. [1820-30] |
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